1 ///////////////////////////////////////////////////////////////////////////////
4 /// \brief CRC64 calculation
6 /// Calculate the CRC64 using the slice-by-four algorithm. This is the same
7 /// idea that is used in crc32_fast.c, but for CRC64 we use only four tables
8 /// instead of eight to avoid increasing CPU cache usage.
10 // Author: Lasse Collin
12 // This file has been put into the public domain.
13 // You can do whatever you want with this file.
15 ///////////////////////////////////////////////////////////////////////////////
18 #include "crc_macros.h"
21 #ifdef WORDS_BIGENDIAN
22 # define A1(x) ((x) >> 56)
28 // See the comments in crc32_fast.c. They aren't duplicated here.
29 extern LZMA_API(uint64_t)
30 lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
34 #ifdef WORDS_BIGENDIAN
39 while ((uintptr_t)(buf) & 3) {
40 crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
44 const uint8_t *const limit = buf + (size & ~(size_t)(3));
48 #ifdef WORDS_BIGENDIAN
49 const uint32_t tmp = (crc >> 32)
50 ^ *(const uint32_t *)(buf);
52 const uint32_t tmp = crc ^ *(const uint32_t *)(buf);
56 crc = lzma_crc64_table[3][A(tmp)]
57 ^ lzma_crc64_table[2][B(tmp)]
59 ^ lzma_crc64_table[1][C(tmp)]
60 ^ lzma_crc64_table[0][D(tmp)];
65 crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
67 #ifdef WORDS_BIGENDIAN